The violation of intellectual property rights (IPR) is a transnational economic and juridical problem. Facing this problem, States had developed multiple approximations to solve the question of why there is IPR violation. One of them, analyzed in this text, is the international treaties directed to protect IPR. The object of this text is to disclose if international treaties had had some kind of influence in the diminution or increase of the IPR violation. In order to solve the questioning, the author analyzes how has been developed the economic theory about the IPR violation showing that the absence of international treaties and international cooperation is an important part of the explanation of IPR violation. As a development of such theoretical framework, the author applies his theory to the copyrights derived from software. Thus,  shows with a bi variable analysis that it is possible to set a correlation that explains the incidence of international multilateral treaties in the diminution of software piracy. The results suggest that international treaties do not affect intellectual property rights violation.